Sound file size in the unit asked

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Sound file size in the unit asked

Name:
Date:
Class:
A

Quick Questions

Shade in the A or B circle for each question.

1. A sound file is 65,536 bits. What is its size in bytes?
A 524,288 bytes
B 8,192 bytes
2. A sound file is 16,384 bytes. What is its size in KiB?
A 16 KiB
B 2,048 KiB
3. Which working changes a sound size in bits into MiB?
A bits ÷ 8 ÷ 1024 ÷ 1024
B bits ÷ 8 ÷ 1024
4. A sound is 7,680,000 bits. What is its size in KiB?
A 7,500 KiB
B 937.5 KiB
5. A sound is 3,145,728 bytes. What is its size in MiB?
A 3 MiB
B 3,072 MiB
B

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left columnRight column
1bits / 8 / 1024 AConverts a sound size in bits to KiB: bits to bytes, then bytes to KiB
2bits / 8 / 1024 / 1024 B32000 * 16 * 240 / 8 / 1024 / 1024
3To give a sound size in KiB, first divide the bits by 8 to get bytes, then divide by 1024 CMisses the divide by 8 step, so the bits never become bytes. It should be bits / 8 / 1024 / 1024.
4Worked example: 32 kHz, 16-bit, 4 minutes. Change to Hz and seconds, multiply, then divide by 8 and by 1024 twice for MiB (about 14.65 MiB) DKiB = bits / 8 / 1024
5KiB = bits / 8 / 1000 EConverts a sound size in bits to MiB: bits to bytes, KiB, then MiB
6MiB = bits / 1024 / 1024 FDivides by 1000 instead of 1024. Each step up the storage unit ladder uses 1024, so it should be bits / 8 / 1024.
C

Definitions

bits / 8 / 1024
D

Fill in the Blanks

Complete each line of code by filling in the missing parts.

1.
bytes = bits / _
2.
kib = _____ / 1024
3.
mib = kib _ 1024
4.
seconds = 2 * __ bits = 44100 * 16 * seconds mib = bits / 8 / 1024 / 1024
5.
hz = 44 * ____ bits = hz * 16 * 60 mib = bits / 8 / 1024 / 1024
E

Spot the Error

Shade in the letter of the line that contains an error.

Question 1
A bits = 44100 * 16 * 60
B bytes = bits / 8
C KiB = bytes / 1000
D OUTPUT KiB
Question 2
A bits = 8000 * 8 * 10
B bytes = bits * 8
C KiB = bytes / 1024
D print(KiB)
Question 3
A bits = 44100 * 16 * 120
B bytes = bits / 8
C KiB = bytes / 1024
D MiB = KiB / 8
E OUTPUT MiB
Question 4
A rate = 44.1 * 1000
B secs = 3 * 100
C bits = rate * secs * 16
D OUTPUT bits
Question 5
A rate = 8 * 100
B secs = 2 * 60
C bits = rate * secs * 16
D OUTPUT bits

Answer Key

Sound file size in the unit asked
Section A: Quick Questions
Q1
B — 8,192 bytes
Q2
A — 16 KiB
Q3
A — bits ÷ 8 ÷ 1024 ÷ 1024
Q4
B — 937.5 KiB
Q5
A — 3 MiB
Section B: Match the Pairs
Q1
bits / 8 / 1024 → Converts a sound size in bits to KiB: bits to bytes, then bytes to KiB
Q2
bits / 8 / 1024 / 1024 → Converts a sound size in bits to MiB: bits to bytes, KiB, then MiB
Q3
To give a sound size in KiB, first divide the bits by 8 to get bytes, then divide by 1024 → KiB = bits / 8 / 1024
Q4
Worked example: 32 kHz, 16-bit, 4 minutes. Change to Hz and seconds, multiply, then divide by 8 and by 1024 twice for MiB (about 14.65 MiB) → 32000 * 16 * 240 / 8 / 1024 / 1024
Q5
KiB = bits / 8 / 1000 → Divides by 1000 instead of 1024. Each step up the storage unit ladder uses 1024, so it should be bits / 8 / 1024.
Q6
MiB = bits / 1024 / 1024 → Misses the divide by 8 step, so the bits never become bytes. It should be bits / 8 / 1024 / 1024.
Section C: Definitions
Q1
bits / 8 / 1024 — Divide the sound size in bits by 8 to get bytes, then by 1024 to get KiB. Divide by 1024 again to get MiB. Stop at the unit the question asks for.
Section D: Fill in the Blanks
Q1
bytes = bits / 8
Q2
kib = bytes / 1024
Q3
mib = kib / 1024
Q4
seconds = 2 * 60 bits = 44100 * 16 * seconds mib = bits / 8 / 1024 / 1024
Q5
hz = 44 * 1000 bits = hz * 16 * 60 mib = bits / 8 / 1024 / 1024
Section E: Spot the Error
Q1
C — Storage units step up by 1024, not 1000. To go from bytes to KiB you divide by 1024, so the line should be KiB = bytes / 1024.
Q2
B — There are 8 bits in a byte, so going from bits to bytes means dividing by 8, not multiplying. It should be bytes = bits / 8.
Q3
D — The step from KiB to MiB is a division by 1024. Dividing by 8 is only for the bits to bytes step. It should be MiB = KiB / 1024.
Q4
B — There are 60 seconds in a minute, so 3 minutes is 3 * 60 seconds. The line should be secs = 3 * 60.
Q5
A — 1 kHz is 1000 Hz (samples per second), so 8 kHz is 8 * 1000. The line should be rate = 8 * 1000.